Does anyone else get a weird squelch when using plain headphones with this phone? I listen to podcasts during my hour commute through an input jack in my car radio. The first day I tried it, I had forgotten the adapter that is part of the package, so I chalked it up to that. However, even with the adapter the next day I still heard it squelch a couple of times (but not as many as before). I made sure all of the connections were good. I haven't tried another cable yet though - maybe that is the problem. Has anyone else experienced this?